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REST API: Introduce selective link embedding. 

Previously the _embed flag would embed all embeddable links in a response even if only a subset of the links were necessary. Now, a list of link relations can be passed in the _embed parameter to restrict the list of embedded objects.

Props rheinardkorf, adamsilverstein, jnylen0, cklosows, chrisvanpatten, TimothyBlynJacobs.
Fixes #39696.

Built from https://develop.svn.wordpress.org/trunk@47224


git-svn-id: http://core.svn.wordpress.org/trunk@47024 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
TimothyBlynJacobs 2020-02-09 20:54:05 +00:00
parent b21985f139
commit 5ecd61023a
3 changed files with 40 additions and 7 deletions
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22
wp-includes/rest-api.php
View File

@ -1571,3 +1571,25 @@ function rest_preload_api_request( $memo, $path ) {
return $memo;
}
/**
* Parses the "_embed" parameter into the list of resources to embed.
*
* @since 5.4.0
*
* @param string|array $embed Raw "_embed" parameter value.
* @return true|string[] Either true to embed all embeds, or a list of relations to embed.
*/
function rest_parse_embed_param( $embed ) {
if ( ! $embed || 'true' === $embed || '1' === $embed ) {
return true;
}
$rels = wp_parse_list( $embed );
if ( ! $rels ) {
return true;
}
return $rels;
}

21
wp-includes/rest-api/class-wp-rest-server.php
View File

@ -398,7 +398,8 @@ class WP_REST_Server {
}
// Embed links inside the request.
$result = $this->response_to_data( $result, isset( $_GET['_embed'] ) );
$embed = isset( $_GET['_embed'] ) ? rest_parse_embed_param( $_GET['_embed'] ) : false;
$result = $this->response_to_data( $result, $embed );
/**
* Filters the API response.
@ -450,9 +451,10 @@ class WP_REST_Server {
* Converts a response to data to send.
*
* @since 4.4.0
* @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
*
* @param WP_REST_Response $response Response object.
* @param bool $embed Whether links should be embedded.
* @param bool|string[] $embed Whether to embed all links, a filtered list of link relations, or no links.
* @return array {
* Data with sub-requests embedded.
*
@ -473,9 +475,11 @@ class WP_REST_Server {
$this->embed_cache = array();
// Determine if this is a numeric array.
if ( wp_is_numeric_array( $data ) ) {
$data = array_map( array( $this, 'embed_links' ), $data );
foreach ( $data as $key => $item ) {
$data[ $key ] = $this->embed_links( $item, $embed );
}
} else {
$data = $this->embed_links( $data );
$data = $this->embed_links( $data, $embed );
}
$this->embed_cache = array();
}
@ -571,8 +575,10 @@ class WP_REST_Server {
* Embeds the links from the data into the request.
*
* @since 4.4.0
* @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
*
* @param array $data Data from the request.
* @param bool|string[] $embed Whether to embed all links or a filtered list of link relations.
* @return array {
* Data with sub-requests embedded.
*
@ -580,7 +586,7 @@ class WP_REST_Server {
* @type array [$_embedded] Embeddeds.
* }
*/
protected function embed_links( $data ) {
protected function embed_links( $data, $embed = true ) {
if ( empty( $data['_links'] ) ) {
return $data;
}
@ -588,6 +594,11 @@ class WP_REST_Server {
$embedded = array();
foreach ( $data['_links'] as $rel => $links ) {
// If a list of relations was specified, and the link relation is not in the whitelist, don't process the link.
if ( is_array( $embed ) && ! in_array( $rel, $embed, true ) ) {
continue;
}
$embeds = array();
foreach ( $links as $item ) {

2
wp-includes/version.php
View File

@ -13,7 +13,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.4-alpha-47223';
$wp_version = '5.4-alpha-47224';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.